Atari 400 Field Service Manual

400 TONE
TEST
MM]
Entsr voice
number
to
he tested (1-4)
and
Preaa
RETURN
Test
remaining
three
voices
YES
Did you hear
lU
eight tones or
speaker elicits*
PASS
iUl.
YES
NO
^The first t«o tones are
very
—
—
high in
frequency: thus.
they
otay
be
inaudible
to
some
ears.
The
TV
speaker clicks
from the
OC level
shifts can
be heard for
each tone.
Replace POKEY
(AlOl)
and retest
Go to CONSOLE
SWITCH TEST.
Page
5-28
PASS
:££s.
Go
to
START,
this
page
NO
Lock SALT
II into
CONTINUOUS
MODE,
restart test
on
VOICE
I, and scope
Pin 37
(AUD)
of AlOl
Go to
next page
ATARI
Home
Computer
5-2i^

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)